One method of terraforming mars would be to (11) asteroids at the planet. rockets attached to enormous asteroid would propel it towards mars, taking ten years to(12) the enormous distances required. the asteroid would (13) the planet with incredible force and ( enough energy to (15) the planet’s temperature. the result would be a temperate climate and lots of water from melting ice caps a-cover b-create c-hit d-increase e-land f-drive g-power h-rise i-shoot
12. drive
13. hit
14. create
15. increase